Side plate for use in sinter grates

ABSTRACT

A sideplate for use in grates for the drying, calcining and sintering of ores, minerals or similar materials, e.g. crude phosphate pellets. The sideplate is comprised of individual sideplate elements arranged to be substantially half overlapped by the side plate elements disposed nearest thereto on the two sides of it, and the overlapping contact between the individual sideplate elements is produced by positioning the head portion of each sideplate element so as to be parallel, at an interval corresponding approximately to wall thickness, with the tail end portions thereof. The base portion of each sideplate element has two bolt-receiving oblong holes disposed therein so as to coincide with each of the holes in the sideplate elements nearest to said element on the two sides of it. The ratio of the sideplate height to the hole spacing therein is selected to correspond to a value higher than 0.86, and the frontal surface area of each sideplate element has a substantially circular base portion and a substantially linear head portion, tangential with respect to the circle arc.

United States Patent Fritz Muller 3 Am grunen Weg, Knapsack near Cologne;

Winfried Schmidt, 8 Am Sonnenhang, Kendenich near Cologne; Hugo Werner, l1 Brunhildstrasse, Hermulheim near 72] Inventors Cologne, Germany [21] Appl. No. 855,698 [22] Filed Sept. 5, 1969 [45] Patented Feb. 16, 1971 [32] Priority Sept. 11, 1968 [33] Germany 1 1,758,985

[ 54] SIDE PLATE FOR USE IN SINTER GRATES [56] References Cited UNITED STATES PATENTS 1,352,312 9/l920 Pines 266/21 3,322,414 5/1967 Boron 266/2lX Primary Examiner-John J. Camby Attorney-Connoly and l-lutz ABSTRACT: A sideplate for use in grates for the drying, calcining and sintering of ores, minerals or similar materials, e.g. crude phosphate pellets. The sideplate is comprised of individual sideplate elements arranged to be substantially half overlapped by the side plate elements disposed nearest thereto on the two sides of it, and the overlapping contact between the individual sideplate elements is produced by positioning the head portion of each sideplate element so as to be parallel, at an interval corresponding approximately to wall thickness, with the tail end portions thereof. The base portion of each sideplate element has two bolt-receiving oblong holes disposed therein so as to coincide with each of the holes in the sideplate elements nearest to said element on the two sides of it. The ratio of the sideplate height to the hole spacing therein is selected to correspond to a value higher than 0.86, and the frontal surface area of each sideplate element has a substantially circular base portion and a substantially linear head portion, tangential with respect to the circle arc.

SIDE PLATE FOR USE IN SINTER GRATES The present invention relates to a sideplate comprised of individual sideplate elements for use in grates for the drying, calcining and sintering of ores, minerals or similar material, e.g. crude phosphate pellets, wherein each individual sideplate element is arranged to be substantially half overlapped by the sideplate elements disposed nearest thereto on the two sides of it, wherein overlapping .contact between the individual sideplate elements is produced by positioning the head portion of each sideplate element so as to be parallel, at an interval corresponding approximately to the sideplates wall thickness, with the tail end portions thereof, and wherein the base portion of each sideplate element has two bolt-receiving oblong holes disposed therein, so as to coincide with each of the holes in the sideplate elements nearest thereto on the two sides of it.

In a conventional device of the type described above, the sideplates are designed to have a circular frontal surface area and a circular rear side, bounding the sideplates front half portion, the two circular areas having substantially the same radius. For these areas it is obligatory to have a circular shape to provide the freedom of movement necessary for the sideplate to pass over the guide rollers. At the same time, however, these circular areas are" found to critically affect the height of the sideplate, which is a function of the guide rollers diameter and a function of the hole spacing in the sideplates. In conventional sideplates, the ratio of sideplate height to the spacing of the holes therein is substantially limited to about 0.86. In other words, the sideplates have a relatively low height. Material placed on the sinter grate to be treated thereon will be found to have a bed height considerably lower near the sinter grate's peripheral portions than in its center portion. As a result thereof,,inhomogeneously sintered material is produced, which is disadvantageous for certain uses. The irregular bed height of the material placed on the grate to be sintered thereon produces a further disadvantageous effect, namely that the sinter grates peripheral portions are subject to substantially more thermal stress than its center portions. Wear phenomena produced by such thennal stress will therefore first and most rapidly appear near the sinter grate's peripheral portions. As results therefrom, it is often necessary for the path supporting the sinter grate to be replaced at a moment at which its center portion still is far from being worn.

The object of the present invention is to provide a sideplate of the type described above which, however, is free from the deficiencies reported hereinabove and designed so as to enable a sinter grate to be supplied with a bed of material substantially uniform in height across the whole grate. This is achieved in accordance with the present invention by the selection of a value higher than 0.86, preferably of about H, for the ratio of the sideplate height to the spacing of the holes therein. The sideplate sodesigned fully satisfies the requirements set forth above. More particularly, it enables material placed on a sinter grate to be substantially uniformly sintered thereon, and the thermal stress of the sinter grates peripheral portions to be minimized. Still further, th'e path supporting the sinter grate awaits replacement only after it has actually undergone substantially uniform wear.

Needless to say a value other than 1.1, for example a value between 0.9 and 1.5, can also be selected for the ratio of sideplate height to the hole spacing therein.

The invention also provides for the frontal surface area of each sideplate element to have a substantially circular base portion and a substantially linear head portion, which is arranged so as to be tangential with respect to the circle arc. The linear portion of the frontal surface area is advantageously beveled so as to form some sort of a cutting edge.

The invention also provides for the rear side, bounding the front half portion of each sideplate element, to be designed in a manner similar to the frontal surface area, i.e. to have a sub stantially circular base portion and a substantially linear head portion, which is arranged so as to be tangential with respect to the circle arc. It is advantageous for the linear portion of the rear side to be beveled in opposite direction with respect to the beveled frontal surface area. In order to provide the freedom of movement necessary for the individual sideplate elements to pass over the guide rollers, the invention also provides for the frontal surface area and the rear side area to include an angle a between 0 and 60.

In the apparatus of the present invention, the two beveled edges enable any dirt accumulating between the individual sideplate elements to be removed while these are being passed over the guide rollers, i.e.' the permanent deposition of dirt between the individual sideplate elements is avoided.

An exemplary representation of the sideplate of the present invention is shown diagrammatically in the accompanying drawings, wherein:

FIG. 1 is a top plan view of the sideplate;

FIG. 2 is a plan view of the sideplate, seen from thegrat side;

FIG. 3 is a plan view of the sideplate, seen from the outside;

FIG. 4 is a plan view of two neighboring sideplate elements, seen from the grate side; and

FIG. 5 is a top plan view of the sideplate shown in FIG. 4.

The sideplate shown diagrammatically in the accompanying drawings is used in grates for drying, calcining and sintering ores, minerals or similar material, e.g. crude phosphate pellets. As can be seen, each sideplate element comprises a front half 1 and a tail half 2, whereby front half 1 is arranged parallel, at an interval corresponding approximately to the sideplates wall thickness, with the tail half 2 so as to obtain overlapping zones. Each sideplate element is arranged to be substantially half overlapped by the following two sideplate elements disposed nearest thereto on the two sides of it. Still further, each sideplate element has two oblong holes 3 and 4 disposed in its base portion, holes 3 and 4 being disposed so as to coincide with holes 4 and 3 in the next following sideplate elements disposed nearest thereto on the two sides of it. As opposed to front hole 3, tail hole 4 is arranged to be concentrically surrounded, at interval 11, by a collar 12, inside which are mounted holder elements fastened to supporting path bolts. Collar 12 opens into a lower ledge 5, and an upper ledge 6 is disposed at the upper end of the sideplate elements, opposite to ledge 5. The lower edge 5 and the upper edge 6 enable the sideplate to be guided and slide on an upper and a lower slide bar (not shown in the drawings).

The typical feature of the sideplate of the present invention resides more particularly in the selection of a value of more than 0.86 for the ratio of the sideplate height h to the hole spacing a. While the selection of a value of about H has been found advantageous, it is also possible to select a value other than 1.1, for example a value between 0.9 and 1.5. As canbe seen, the frontal surface 7 of each sideplate element has a substantially circular base portion 7' and a substantially linear head portion 7", whichis arranged to be substantially tangential to are circle 7. The linear head portion 7" of frontal surface area 7 is beveled at 8 so as to form some sort of a cutting edge.

Similar statements apply to the rear surface area 9 of the sideplates front half 1. The rear surface area 9 also has a circular base portion 9' and a substantially linear head portion 9". The linear head portion 9" of rear surface area 9 is beveled at 10 in a direction opposite with respect to beveled portion 8 of frontal surface area 7. The assumed extensions of linear parts 7" and 9" of the frontal surface area and rear surface area 7 and 9 boundingfront half 1 include an angle a between 0 and 60, e.g. about 25.

The beveled parts 8 and 9 are arranged to cooperate with one another as can be seen from FIGS. 5 and 4 showing two two beveled parts 8 and 10 producing a shearing effect enable all contaminants and dirt to be removed, which may have accumulated therein, while the sideplate elements pass around the guide rollers.

Needless to saythe invention is in no way limited to the exemplary representation shown in the accompanying drawings. lt admits of various modifications without departing from its scope.

We claim:

- 1. in a sideplate comprised of individual sideplate elements for use in grates for the drying, calcining and sintering of ores, minerals or similar materials, e.g. crude phosphate pellets, wherein each individual sideplate element is arranged to be substantially half overlapped by the sideplate elements disposed nearest thereto on the two sides of it, wherein overlapping contact between the individual sideplate elements is produced by positioning the head portion of each sideplate element so as to be parallel, at an interval corresponding approximately to the sideplates wall thickness, with the tail end portions thereof, and wherein the base portion of each sideplate element has two bolt-receiving oblong holes disposed therein, so as to coincide with each of the holes in the sideplate elements nearest to said element on the two sides of it, the improvement according to which the ratio of the sideplate height to the hole spacing therein is selected to correspond to a value higher than 0.86, and the frontal surface area of each sideplate element has a substantially circular base portion and a substantially linear head portion, tangential with respect to the circle are.

2. The sideplate as claimed in claim 1, wherein the linear portion of the frontal surface area of each sideplate element is beveled so as to form a cutting edge.

3. The sideplate as claimed in claim 1, wherein the rear side, bounding the front half portion of each sideplate element has a substantially circular'base portion and a substantially linear head portion, tangential with respect to the circle are.

4. The sideplate as claimed in claim 1, wherein the linear portion of the rear side bounding the from half portion of each sideplate element is beveled in opposite direction with respect to the beveled frontal surface of each sideplate element.

5. The sideplate as claimed in claim 1, wherein the assumed extensions of the linear portions of the frontal surface area and rear surface area bounding the front half portion of each sideplate element include an angle between 0 and 60.

6. The sideplate as claimed in claim 1, wherein the ratio of the sideplate height to the hole spacing therein is selected to correspond to a value of about 1.1.

$3330 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 5 5 Dated Februarv l6. l97l Fritz Muller et a1 Inventor(s) It is certified that error appears in the above-identified paten' and that said Letters Patent are hereby corrected as shown below:

In the title page after line [45] the following should be inserted: I

[73] ig Knapsack Alctiengesellschaft Knapsack bei Kbln, Germany a. corporation of Germany Signed and sealed this 11 th day of September 1971 (SEAL) Attest:

EDWARD M.FLETGHER,JR. ROBERT OTTSCHALK Atte sting Officer Acting Commissioner of P 

1. In a sideplate comprised of individual sideplate elements for use in grates for the drying, calcining and sintering of ores, minerals or similar materials, e.g. crude phosphate pellets, wherein each individual sideplate element is arranged to be substantially half overlapped by the sideplate elements disposed nearest thereto on the two sides of it, wherein overlapping contact between the individual sideplate elements is produced by positioning the head portion of each sideplate element so as to be parallel, at an interval corresponding approximately to the sideplate''s wall thickness, with the tail end portions thereof, and wherein the base portion of each sideplate element has two bolt-receiving oblong holes disposed therein, so as to coincide with each of the holes in the sideplate elements nearest to said element on the two sides of it, the improvement according to which the ratio of the sideplate height to the hole spacing therein is selected to correspond to a value higher than 0.86, and the frontal surface area of each sideplate element has a substantially circular base portIon and a substantially linear head portion, tangential with respect to the circle arc.
 2. The sideplate as claimed in claim 1, wherein the linear portion of the frontal surface area of each sideplate element is beveled so as to form a cutting edge.
 3. The sideplate as claimed in claim 1, wherein the rear side, bounding the front half portion of each sideplate element has a substantially circular base portion and a substantially linear head portion, tangential with respect to the circle arc.
 4. The sideplate as claimed in claim 1, wherein the linear portion of the rear side bounding the front half portion of each sideplate element is beveled in opposite direction with respect to the beveled frontal surface of each sideplate element.
 5. The sideplate as claimed in claim 1, wherein the assumed extensions of the linear portions of the frontal surface area and rear surface area bounding the front half portion of each sideplate element include an angle between 0* and 60*.
 6. The sideplate as claimed in claim 1, wherein the ratio of the sideplate height to the hole spacing therein is selected to correspond to a value of about 1.1. 